19264172321 has 4 divisors (see below), whose sum is σ = 19266983700. Its totient is φ = 19261360944.

The previous prime is 19264172243. The next prime is 19264172327. The reversal of 19264172321 is 12327146291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12327146291 = 20707 ⋅595313.

It can be written as a sum of positive squares in 2 ways, for example, as 5361168400 + 13903003921 = 73220^2 + 117911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19264172321 is a prime.

It is a super-2 number, since 2×19264172321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19264172327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395386 + ... + 1409123.

It is an arithmetic number, because the mean of its divisors is an integer number (4816745925).

Almost surely, 2^19264172321 is an apocalyptic number.

It is an amenable number.

19264172321 is a deficient number, since it is larger than the sum of its proper divisors (2811379).

19264172321 is an equidigital number, since it uses as much as digits as its factorization.

19264172321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811378.

The product of its digits is 36288, while the sum is 38.

The spelling of 19264172321 in words is "nineteen billion, two hundred sixty-four million, one hundred seventy-two thousand, three hundred twenty-one".